Pole cross-arm.



.UNITED srainnrorrrcn CHARLS Gr. ETT'E, OF ST. IJOUIS, MISSOURI, ASSIGNOR T0 ETTE INVESTMENT COM- i IVANY, OF ST. LOUIS, MISSOURI, A CORPORATION OF MISSOURI.

POLE CROSS-ARM.

To all lwhom t may concern Be it known that I, CHARLES Gr. Erma, a:` citizen of the United States, residing at St. Louis, Missouri, have invented a certain new and useful Improvement in Pole Cross- Arms, of which the following is a full, clear, and exact description, such as will enablei others skilled in the art to which it apperi tains to make and use the same.

This invention relates to cross-,arms such as are used on poles forcarrying insulators.

The main object of the invention is to pro* vide a metallic insulator-supporting struc-- ture that Vcan be manufactured at alower cost than the wooden cross-arms now in general use and which is more efficient, lighter, and has agreater capacity than a wooden insulator-supporting structure. And another object of my invention is to provide a metallic'insulator-supporting structure in which the insulator-pins can be applied or removed easily, and which is so designed that the pins cannot work loose from the insulators or from the member which supports the insulator-pins. j

Other objects and desirable features of my y invention'will be hereinafter pointed out.

Briefly stated, my invention consists in an insulator-supporting structure that com prises a metallic cross-arm member having laterally projecting flanges that are tapered or provided with faces which are inclined with relation to the insulator-pins, and vertically disposed insulator-pins that pass through openings in said flanges and which are formed from, iron rods provided with screw-threaded portions for receiving nuts which bear upon the inclined faces on the flanges of said cross-arm member.

- Figure l of the drawings is a front elevational view of a metallic inslator-sup-` porting structure constructed in accordance with my invention; Fig. 2 is a similar viewshowing how the lower insulator-pins can be arranged so that the insulators mounted thereonV will lie directly under the insulators on theupperpins; FigB is a transverse sectional view of the cross-arm member showing how the tapered flanges 'thereon preventthe nu-ts on the insulator-pins from turning; Fig. 4 is an end view of the cross arm member showing one kind of nut that can be used with the insulator-pins; Fig. 5 is'an end view showing one way of preventing the insulator-pins r'from moving vertin Specification of Letters Patent.

Patented May 28,1912.

Application filed November 22, 1911. Serial No. 661,769v4 cally relatively to the cross-arm member; and Fig. 6 is an end View showing the insulator-pins arranged in such a position with relation to the vertical web of the cross-arm member that said web prevents. the nuts on the'pins from turning.

Referring to the drawings which illustrate my invention, A designates a metallic crossarm member which consists of a vertically disposed web provided with a pair of laterally projecting flanges 1 whose inner faces 2 are inclined with relation to the vertical web, the outer faces of said flanges 1 lying at approximately right angles to the vertical web of the member A, thus forming a chan* nel-shaped member whose horizontal legs or flanges are tapered. The member A is provided with a plurality of metallic insulatorpins that pass through both flanges l of the member A and which are `locked in position by means' of nuts that coperate with the flanges l on said cross-arm member. In the embodiment of my invention herein shown, a set of insulator-pins B are arranged on the upper side of the cross-arm member A, and a set of insulator-pins C are arranged on the lower side of said member, the lower insulator-pins C being preferably designed in such a manner that they can be adjusted so as to arrange the insulators thereony in staggered relation to the insulators on the upper pins or 4directly underneath the insulators onthe upper pins, thereby enabling a large number of insulator-pins to be mounted on a comparatively short cross-arm. Both sets of pins are preferably formed from iron rods which have been cut into shortlengths or sections andthreaded at one end to receive the heads D on which the insulators are screwed, and threaded at ltheir opposite ends to receive the nuts which coperate with the tapered flanges on the member'A to hold the pins in position and prevent them from turning relatively to the member A. The upperinsulatonpins B pass vertically through alining holesor openings y in the *flanges l on the member A, and nuts 3 and 4c vare arranged on'the screw-threaded vportions 5 at the lower ends of said pins above and below thebottom flange ll of the" cross-arm member A so as to lockthe pins lin position and prevent them from turning. The upper pins B are arranged in position by inserting them in the openings in the top flange of the member A,then screwing the nuts 3 onto the screw-threaded portions of said pins, and finally inserting the pins through the bottom flange of the member A and screwing the nuts 4 onto the screw-threaded portions 5 of the pins on the under side of the bottom flange of the member A. 'In view of the fact that the surface of the member A, against which the nuts 3 bear, is inclined with relation to the pins B, it will be impossible for the pins B and nuts 3 to turn or rotate relatively to the member A, even if the nuts 4 on the under side of the bottom flange of the member A are not screwed up tightly against said flange for any movement of the nuts 3 causes them to cant and thus grip the pins tightly. Consequently, the vibration of the wires which are connected to the insulators has no edect on the insulator-pins and will not cause the heads D of the pins to screw out of the insulators be-` cause the nuts 8 and the coperating inclined surface on the bottom flange of the member A on which said nuts bear, positively prevents the insulator-pins from turning. Nor it is possible for the pins to turn or rotate in the nuts 3 for said nuts bear upon the inclined face of the bottom flange of the member A and thus prevent the pins from turning in one direction, and the wires which are connected to the insulators that are mounted on the heads on the pins B prevent the pins from turning in the opposite direction, it heilig', of course, understood that the insulators are screwed down tight upon the heads D of the upper pins.

Vhile I have stated that nuts 4 are` screwed onto the lower ends of the pins B underneath the bottom flange of the crossarm member A so as to prevent the pins from moving upwardly, the nuts 4 could be omitted and the lower ends of the pins could be bent laterally, as shown in Fig. 5, so as to prevent them from moving upwardly. Ordinary nuts, either square or hexagonal-shape, can be used with the pins, or, if desired, nuts 13 which are tapered or inclined on the under side could be mounted on the pins above the bottom flange of the member A, as shown in Fig. 4.

The lower pins C, which are arranged on the under side of the cross-arm member A, pass upwardly through holes in the horizontal flanges of said member, and nuts 3a and 4a are mounted on the screw-threaded portion 5a atthe upper ends of said pins and are arranged on opposite sides of the top flange of the member A so as to prevent the pins C from turning or moving vertically. The lower pins C are provided with laterally projecting upturned arms 6 on which insulator-heads D are mounted so as to permit the insulators on the under sideof the cross-arm member A to be arranged either in staggered relation to the insulators on the upper side of the crossarm member A, as shown in Fig. 1, or directly underneath the upper insulator-pins B, as shown in Fig. 2.

Instead of relying upon the inclined inner .faces of the flanges 1 on the cross-arm member A to prevent the nuts 3 and 3a from turning, the openings in the flanges on the member A, through which the insulator-pins pass, can be formed close enough to the vertical web of said member to cause said nuts to strike against said vertical web in case the nuts start to turn, this feature being illustrated in Fig. 6.

W'hile I have herein shown only one means for preventing the lower pins C from moving downwardly, namely, the nuts 4a which are arranged above the top flange of the cross-arm member A, it will, of course, be understood that said nuts could be omitted and the upper ends of the pins bent over or turned laterally in the same manner illustrated in Fig. 5.

Having thus described my invention,what I claim as new and desire to secure by Letters Patent is:

1. A cross-arm member provided with laterally projecting flanges that have inclined surfaces, a vertically disposed insulator-pin passing through said flanges, a nut mounted on said pin and bearing upon the inclined face of one of said flanges, and means located on the other side of said flange for preventing the pin from moving vertically in one direction.

2. A cross-arm member providedwith laterally projecting flanges that have inclined faces, an insulator-pin passing through said flanges and provided with a screw-threaded portion, and nuts mounted on said screwthreaded port-ion and arranged on opposite sides of one of said flanges, one of said nuts being adapted to bear upon the inclined face on said flange.

3. A cross-arm consisting of a substantially channel-shaped member provided with laterally projecting flanges whose inner faces are inclined, a vertically disposed insulator-pin passing vthrough both of said flanges, and a nut arranged on said pin and provided with an inclined face that bears against the inclined face on one of said flanges.

In testimony whereof I hereunto alliX my signature in the presence of two witnesses, this twentieth day of November 1911.

CHARLES Gr. ETTE. Vitnesses:

VALTER C. Rarrrngmf "1 EDWARD Sci-IwrDD.'

Gopies of this patent may be obtained for ive cents each, by addressing the Commissioner of Patents. g

Washington, D. C. 

